Send me email updates about messages I've received
on the site and the latest news from The CafeMom Team.By signing up, you certify that
you are female and accept the Terms of Service and have read the
Privacy Policy.

Which word do you use in this sentence?

There is a big argument with my family about which word to use in this sentence, passed or past. "My bill is passed/past due." Which one is correct. I no its silly but everone seems to be mixing up the definitions of the words trying to prove themselves right.